valueProcess.js

import("system.result");
import("system.db");
import("system.vars");
import("Sql_lib");

var orgId = vars.get("$field.ORGANISATION_ID");
if (orgId)
{
    var orgContactId = db.cell(SqlCondition.begin()
                                           .andPrepare("CONTACT.ORGANISATION_ID", orgId)
                                           .and("CONTACT.PERSON_ID is null")
                                           .buildSql("select CONTACT.CONTACTID from CONTACT"));
    result.string(orgContactId);
}